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There are two types of allophones: complementary allophones and free-variant allophones. Complementary allophones are not interchangeable. If context requires a speaker to use a specific allophone for a given phoneme (that is, using a different allophone would confuse listeners), the possible allophones are said to be complementary.
Simplified chart / decision tree to determine whether two sounds which occur in the words of a language are allophones of the same phoneme, separate phonemes, or in free variation. For explanations of terms and procedures, see articles Allophone, Complementary distribution, Minimal pair, Free variation, and Phoneme.
Each phoneme may have multiple allophones, i.e. different realizations of the same phoneme. For example, in the /B/ handshape, the bending of the selected fingers may vary from straight to bent at the lowest joint, and the position of the thumb may vary from stretched at the side of the hand to fold in the palm of the hand.
Such spoken variations of a single phoneme are known by linguists as allophones. Linguists use slashes in the IPA to transcribe phonemes but square brackets to transcribe more precise pronunciation details, including allophones; they describe this basic distinction as phonemic versus phonetic.
In most dialects, the fortis stops and affricate /p, t, tʃ, k/ have various different allophones, and are distinguished from the lenis stops and affricate /b, d, dʒ, ɡ/ by several phonetic features. [21] The allophones of the fortes /p, t, tʃ, k/ include: aspirated [pʰ, tʰ, kʰ] when they occur in the onset of a stressed syllable, as in ...
The International Phonetic Alphabet (IPA) can be used to represent sound correspondences among various accents and dialects of the English language.. These charts give a diaphoneme for each sound, followed by its realization in different dialects.
Alternations provide linguists with data that allow them to determine the allophones and allomorphs of a language's phonemes and morphemes and to develop analyses determining the distribution of those allophones and allomorphs. The term "sound change" refers to diachronic changes, which occur in a language's sound system.
The sounds marked in parentheses in the table above are allophones: [ŋ] is an allophone of /n/ occurring before /k/ and /ɡ/ For example, ring ('ring') is [riŋɡ]; [ŋ] did not occur alone in Middle English, unlike in Modern English. [ç, x] are allophones of /h/ in syllable-final position after front and back vowels, respectively.